There are two open editions (usually not out of stock) pins available at the US Disney Parks.
1. Anna/Elsa Snowflake pin which retails for $8.95 or $9.95.
2. Booster pack of 4 pins, featuring Anna, Elsa, Olaf, and the castle, which retails for $22.95
Other pins:
The Disney Store.com release was on a Sunday at midnight. It "sold out" in less than 1 minute. Then came back again at 2 a.m. then "sold out" again. Then came back at 5 a.m. and this time, finally sold out. I just remember being up at midnight, finding the pin, putting it in the cart and when I went to check out, it disappeared! So disappointing. It retailed for $24.95
There was also a 5-pin set (4 pins were previewed on the flyer, 1 pin showed up as a "surprise" pin) at Disney Soda Fountain (well, now it's Ghirardelli Soda Fountain) which was released on a Friday. Almost 700 people showed up for the LE400 pin set (one of the pins was LE500) so that pin set sold out too. Each pin retailed for $14.95 to $18.95, I think.
Opening Day Pin of Olaf in a Snowglobe. This is a LE2500 pin, released at both WDW and DLR. It sold out in 3-4 days. This was $11.95 or $12.95.
Disneyland Paris has two open edition pins. One of Anna/Elsa in a heart, the other of Olaf (looks very similar to the DSF/GSF pin). These retailed for 6.99 and 8.99 Euro (sorry can't do that symbol here, you'd have to use a currency converter to figure out the USD price). Then there was a LE600 pin of Anna that was just released within the past week. That sold out in one day to the 300 people that were there (2 pins per person, sold only INSIDE the park, so you had to purchase park admission to even get the pin)
And then, of course, there should be Frozen pins for the newest Adventures by Disney Trip to Norway (which starts out at $5000-6000 per person).
I think that's it (for now).
So, to answer your question, you can call Disney Parks Merchandise at 407-363-6200 (I think there's an 800 number, I need to go look for it) and tell them what you want to order.
SKU for the pins are:
400007939592 - Opening Day Olaf Pin (in case they find one)
I have the SKU for the booster pack, just not in front of me. And I never did get the OE anna/Elsa snowflake pin (yet)