lol @ the threajack

Like a bosses
To counter the jack, I'll kick in some free advice. Its worth whatever you think, or a pitcher of warm spit... No resale value, but the following is based on decades of doing this:
To the OP, you'll have no problems finding a low cost projector with a SD card input. Even Spencer's gifts is selling a 10K unit that reads a SD for 160$. The one I evaluated was actually useful, even if the scanners were slower then a snail. But it came with a whopping 15 seconds of content. The time resolution was 1 second. No way to sync to music.
It might work well for a point of sale display or repeating Christmas display indoors.
Other then the lame BMP tracing software that SOMETIMES comes with the cheapies, your issue will be frame creation software. So if you have friends with ILDA type zero framesets, your in good shape.
Otherwise your looking at still needing software/hardware combo such as , ILD-SOS, I-show, Laserboy, LaserGraph-DSP, LFI-Player - LSX- Mamba- Phoenix -Pangolin Quick Show, Pangolin Beyond -********* , etc. (In alphbetical order) to make artwork/content to make the projector really useful.
The SD card based stuff just plays frames in loops. You usually have no buttons to push, it just plays the card.
So if you invest, you hit hidden costs in the software. Some of the above are freeware-cheapware, others start at 600 and up. Free stuff tends to be simpler and trades off time for software sophistication. Cheaper stuff usually does not come with clip-art and finished shows. Often there is no "manual" mode for doing real time stuff.
Stay away from ISHOW. Its lame for the $$$. The hardware is OK, but the effects are limited. 1 second time resolution.. Most people who get it regret it. Some don't, but that is very few.
Buy the best projector you can, at the most power you can afford. 150 mW is fine for in the basement, but buying 150 mW and then finding you really needed 1 watt means your cheap unit lost 50-60% of its resale value the minute you opened the box.
So figure there is far more to this then just a projector... Fog source, cables, controller,
Buy it Or build it, following advice on both forums.
Make sure you have ANALOG, not TTL lasers, 7 colors + black from TTL/ON-OFF is a severe limitation. 12-15K scanners are outdated, 20K scanners are cheap and useful, 30K scanners are far better.
Steve