Budget Resonators (Under $100)

Basic resonator combo

level 2 tuner + level 4 fiend = Level 6 Red Rising Syncro

Level 6 Red Rising effect to bring back Level 2 Tuner

Red Rising + Level 2 Tuner = Level 8 Dragon

If you have a Synkron Resonator from hand you can do a follow up

Level 8 Dragon + Synkron (special summoned by having a level 8 Syncro on the board) =  Scarlight RDA (1 free negate per turn)

or

If you recycle a Crimson Resonator it lets you grab 2 more tuners for more crazy combos

Level 6 Red Rising + Level 2 Chrismon + (2x) Red Resonator off Crimsons effect = Red Super Nova