Alot of places to order from if you know EXACTLY what to order...

http://www.easternmarine.com/em_store/trailerbrakes/trailerbrakes_ele.html

http://www.trailerpart.com/?gclid=CIW-hKHE064CFecQNAod_h-pfA

 http://www.etrailer.com/dept-pg-Trailer_Brakes.aspx

http://www.trailerpartsdepot.com/items.asp?Cc=ELEC-DRU&iTpStatus=0&Tp=&Bc=

We should have all the brake parts, or assemblies, in stock.  If you can call and tell us what size (weight capapcity) the axles are, we can give you pricing.  We are in central Indiana, and UPS goes to Michigan every day.  Auto parts stores, at least around here, do not carry trailer brake parts.  Sometimes you can find a bearing or a seal, but not always.