The costumebase Jedi costumes are low quality. May be cheap, but you get what you pay for.
Museum Replicas costumes are higher quality but also pricey. There is a whole discussion about how their pieces are not very screen accurate considering the premium price you're paying for them. MRL also is not offering full "Buy-It-Now" costumes. They're currently only offering various costume pieces for sale.
Check out Clothearscostumes.com in the UK.
Absolutely stunning work, best I have come across bar none!
A real pleasure to work with and their attention to detail is second to none!