There have been a TON of questions about the transfers. Although I've only used the light transfer paper, I've carefully read all the responses so I'd like to summerize it all...trying to be helpful.
There are two types of transfer paper...light transfer paper for light colored shirts and dark transfer paper for placing images on darker shirts.
So far I haven't heard anything about price equating with quality. Alot of people use avery, I myself have used this brand...it works fine. You can buy it at wal-mart, office supply stores, and ebay.
Make sure you print your image in reverse so that words will not be backwards in the end product. Some imaging programs will have a menu where you can choose "transfer" or "mirror image". I have the option in both printshop 15 and in the printer menu for my Lexmark. Look under options or under the help menu.
Practice printing it on plain paper to make sure the size and COLORS are what you expect. You may also want to do a test iron-on with some scrap fabric so as not to waste precious tshirts.
Beware that white spaces will print blank with light transfer paper. Meaning, if you put donald duck on a pink shirt with light paper, he will have pink feathers. Most non-commercial printers won't print white. Of course, if you're determined NOT to use dark paper and you are using a nonwhite light colored shirt, a print store may be able to do the printing for you. Does anyone know if Ginkos has white ink in their printers? However, you can avoid this by using dark paper. Some people have complained about the texture. I've heard it called "rubbery". Remember, though, even commercially printed dark tees tend to have a slick/rubber feel to them. If you really want a darker/brighter tshirt (especially if you have kids and white is NOT an option) don't automatically discount the dark transfer b/c you're afraid of the texture. I imagine that if you're doing a very large image it could make a large area of your shirt stiff which could lead to some discomfort. With dark transfer paper, white AND clear spaces will be white. If this bothers you I have a suggestion. An earlier poster created an image of tinkerbell on a white background but she was putting the image on a lime green shirt. She found a color on her pallette that printed in a near matching shade and made the background that color. You could see a slight rectangular shape on the shirt where the edges of the transfer were but it was such a close color match, I think it looked great.
As for tshirt quality, I bought a package of white undershirts from the mens department at
walmart one year....avoid doing this for women...bras show thru! The only time shirts have to be 100% cotton is if you're tie-dying. I think any blend can be used for transfers. MAKE SURE TO WASH IT FIRST. You don't want the shirt to shrink after you've done the tranfer.
Follow the tranfer sheet directions to the letter. If directions are lacking, I'd consider purchasing a different brand. Generic directions: USE A HARD SURFACE. I wouldn't do it on a glass table but glass top stoves seem to work well. I personally prefer and ironing board (call me old fashioned). Use the hottest setting....and press hard! Put your weight into it...but don't break the stove. I like using my ironing board on the floor. After a few minutes I test the corner to see if it pulls away easily. If not I put it down and run the iron over it for a few more minutes. If it peels off easily but you hit a spot that won't budge...just reheat it. I've seen a question about ironing in circles or corner to corner...just do a section at a time...top to bottom or bottom to top...doesn't matter where you start as long as you do each secition in order (as in, do one corner, then the diagonal corner then the middle and you might wind up with a gap and therefore a bubble or wrinkle.) I think once you've thouroghly heated the whole thing, its safe to do circles.
Ok..think I've covered it all. Let me know if I left anything out.
No one would see it but I'd know it was there 
The ME folks should be able to deliver us to correct resort. I think it would be great fun to go up to the ME desk and say "guess where we're headed...". 
Only problem is I've already got a Dash shirt for DS and we're planning on MGM on arrival day so I want DS to see Incredibles with Dash shirt. Guess he'll be changing at the resort before we head out to the parks.
