I would think you could find some used 15x7 Tacoma alloy wheels locally. Maybe on craigslist...just be leary of scammers. If you're thinking aftermarket...Discount Tire or (Americas Tire) are the best at service.

Here's an example of a small leveling kits from one of our sponsors below...Suspension Connection:
http://www.suspensionconnection.com/cgi-bin/suscon/KT09105T2L.html
I'm guessing the installation for this one involves dis-assembling the coilover. It would be better to search for one that just bolts on, above the coilover. Check on Ebay, reply with a link when you find one.

Wheeling a Stepside Tacoma on 37s
Exploring in a T4R Ltd V8