Randen, - it is hard to beat fiberglass bats at those prices. Remember this is a garage, not a living space.
Here in Oklahoma, they get anywhere from $2-3 per sq foot for open cell foam at two inches thick. Yes, spray on foam IS tremendous and does block the wind, etc.
But a few cans of expanding foam in the bad spots (3 cans, $15 total), some fiberglass batts ($50) and some 2 mil plastic on top of that ($10) would be about as inexpensive (total < $100) and quick as you can get (literally a Saturday morning or afternoon project).
But you are correct - a foam quote is the way to tell . . . .
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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