Invest in a descent radio and build your own. Thousands of free plans on rge web and building materials are dirt cheap. Adams Foam Board (Dollar Tree Foam) is very popular at only $1 per sheet, most planes can be built for just a few bucks. If you crash, it a little hot glue and your ready to go...
Do the RPM bumpers come with mounting hoops? If so, and they are still available, I'll take them.
Re: BLUE RPM front and rear bumpers, $10 shipped
-Buk