Exchanges vary in price....from $5.00 (the animals ones that have been going on...next to start 9-1) to $25.
Depends on what the host wants to do.
For me, with postage so high, I figure I might as well spend more on things to go in also. The prices a host lists is the minimum....a lot of people spend more, but as long as the minimum is met all is good.
The socks will have a price limit also.....I think last time it was $8, but I'm not sure about this time...I think it might be $10.