Affordable Lowering Leaf Springs for C10

[76C10Stepside]

I recently installed lowering shackles on my '76 C10. The 2-inch drop produced is way too little. There's still 3-1/2 inches between the tire and the fender lip. I'm running 275/60-15's on all four corners. Another 3 inches would be good.

I considered raising the front brackets 2 inches, but that would only give me another 1 inch of total drop, and installing a flip kit and notching my frame rails or removing a leaf, but after reading about suspension dynamics and leaf springs, decided lowering leaf springs is a better way to go.

Where can I get AFFORDABLE lowering leaf springs for my truck???

I've scouring the web for an affordable set of lowering leaf springs for my 76 C10 stepside. I found lots of sets for S10/S15, Jeeps and lots of Fords. The S10 springs are as low as $125-150. The only ones I've found for the C10 are these at summit racing for $426.95 (too high!):

http://www.summitracing.com/parts/WST-731014/