I have ordered several times from Greatmodels.com. They appears to have a decent webiste and their prices are very good, but I feel somewhat jaded as many of the items they claim to have in stock are in-fact not. I would say of the 20 or so items I have ordered, about 5 have been immediately in stock. Of the rest, some eventually make it in from their distributors and many do not. They also put your orders on hold until you give them a status as to what you want to do - manual intervention. And then it takes them at least 48 hours to close the order and ship it.
Squadron by comparison has been very prompt in filling their orders. I have encountered a couple of items that they had listed but didn't have in stock, but no where near the amount of backorders I've encountered with Greatmodels.
Ah, to have an Amazon-like system with up-to-date inventories ;-)
- Snacko