Yes, you can purchase chemical stripper. It'll be at your local home store, in the paint aisle. Paint it on, wait for it to bubble, then scrape it off. A few notes for you, since I just finished doing this to a window and two cabinets:
1) First, this is nasty stuff. Have plenty of ventilation. If the old paint contains lead (and it probably does), take extra precautions, especially when sanding. Definitely wear a mask with a suitable rating.
2) When stripping, strip over a thick plastic tarp and wear good gloves. It's very messy, and you'll want to have easy cleanup when you're done.
3) Get metal scrapers that have curves. It's the only way to get in there. Flat areas are easier than curves and decorations, so hopefully your cabinets are plain.
4) If you have a lot of paint on them, expect to have to do this in several passes.
5) You'll still have to do a lot of sanding. The paint gets into the grain, and it takes a lot to get it out. Plus, you have to sand between layers of stain and poly. You'll have to pre-stain, then stain (1-2 coats), then poly (2-4 coats). A lot of work.
Honestly, if you're flipping, this is NOT worth the effort. Flipping is about getting the most bang for your buck. You'd be better off getting new cabinets from IKEA, or painting the ones you have.
If you REALLY want to strip, consider hiring a pro. Really. Some (definitely not all) professional painters are set up to do this, and it will probably be worth it given how much time this takes.