Any method that is cheap on cash is expensive on time and reliability. I have heard people using things like 1000 watt work lights. Shop heaters, heat guns, and etc. all have reliability and consistency issues and ruin a lot of shirts (aka your profit).
Can you contract out a few jobs so you can save enough for a IR flash. Check for used ones or go with an economy model from some place like ryonet. If your good you will make enough to upgrade quickly anyways. It's not as good as getting what you need for the long run up front but it certainly works when you are trying to bootstrap.
My two cents, toss them in a well and make a wish.
Can you contract out a few jobs so you can save enough for a IR flash. Check for used ones or go with an economy model from some place like ryonet. If your good you will make enough to upgrade quickly anyways. It's not as good as getting what you need for the long run up front but it certainly works when you are trying to bootstrap.
My two cents, toss them in a well and make a wish.