Yes and no on the retracts. They are what they are and price will be an issue but you have to realize that these are cottage industry efforts at best and they never sell that many sets that would drive the price down. I will add that Century Jet is a viable option and a bit cheaper as they include pretty much everything you need whereas the Robart gear has a better finished appearance and some would argue the overall quality is better. I've used both and have no gripes about either (EXCEPT for the Robart 615's but that's another story completely!). I've also used Springair with great success. These "stock" retracts are expensive only until you decide on a custom set of gear! You won't ever question "stock" gear prices again!!!
Yes they're expensive so sit down and ask yourself "can I live with fixed gear on a warbird?" For most the answer is no. It's a reality of the hobby!
Make sure you're happy with whatever choice you make and go for it! It's supposed to be fun!!!
I hope this helps,

Mark