Where did you say this was available?
Any paint store or department. They have oil based, water based and alcohol based. The Water based has a blue and white can, the oil based is gold and white and the alcohol based is red and white- tehy have all of these because it's often used for repainting after fire or water damage and you never want to use paint with a base that's similar to the stain. This means that a water stain that has completely dried should be painted with oil based, an oil based stain should be painted with the alcohol based primer and water based primer can be used on fresh walls or any time it won't dissolve something under it. If teh wrong primer is used, the stain will bleed through because it has been dissolved and the primer can't act as a barrier. I don't think any of them are more than $20/gallon.
If you need a compressor and spray gun anyway (we all do, it's just that not all of us have done anything about it), Harbor freight has the best prices, especially when they're on sale. They sell a gravity fed HVLP conversion gun for about $15 (best price) and that's what I used to shoot my kitchen cabinets with satin Minwax polyurethane. The bigger the compressor, the less water will get to the gun but any time spraying a finish with a compressor is an option, good filtering is an absolute must. I sprayed primer on all of my trim when I replaced it, too. In spring, I'll re-paint the silver on my truck with it, too.
