These things don't go on sale.  
If you can't swing $40 you need to budget for a long term goal.  
What is your motivation for lower cost?  What is your goal?  Single player fight stick?  Desktop control panel? Bartop? Pedestal Cab? Full size 4 player upright?  If you don't have an answer for this, Vigolix is your answer.  What are your favorite games? 
KADE / AVRs are the new custom keyboard hack for the ages.  I don't quite recall when keyboard encoders came on the scene, but oh man, if we had IPACs, KADES and Keywhizs back then, BYOAC would have been a totally different landscape.