As stated above, anything related to UTV performance (or even general parts) are generally marked up pretty high. There are ZERO budget long travel kits out there. As de3 stated, you can't beat the original Maxxis Bighorns for longevity and durability. BTW, welcome to the site (best Prowler forum out there!).
09 Prowler 700 XTX, Dynatek FS cdi and coil kit, Maxxis Bighorns, Warn 3500 lb winch, factory windshield/wiper and roof, Trail Armor doors, cage chopped 4", BEARD rear bench seat w/ 4 point harnesses, custom built extended cage. Rockford Fosgate RFX9400 marine stereo, Scosche 6.5' 3-way speakers in custom built overhead console and MB Quart NAU260 marine amplifier. Cobra CB. Sunpro volt, oil pressure and water temp gauges. Custom gauge plate built by RD. Peel 7 Seal lined doghouse.