I made a post responding to a similar question on reddit, so I'll just copy/paste the answer here. Sorry in advance if there are any parts of the answer that doesn't fit your question exactly, for example the other poster had a much lower budget than yours, but I cant be arsed to rewrite the whole thing
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You might be able to get like a dirt cheap projector like this:
NEW 600mW rgb mini party lights,disco laser/animation laser projector for christmas-in Stage Lighting Effect from Lights & Lighting on Aliexpress.com | Alibaba Group
The projector linked above actually does seem to have an ILDA connector. It's still not a good projector at all, but if you only care about low price, it will have to do. I would really recommend upgrading to at least something like this, though, which is probably around twice the power and also supports analog color modulation if you ask for it (practically unlimited number of color vs only 7 on TTL):
SD Card 1200mw ilda & dmx rgb laser sd card, 1.2W RGB animation laser sd card-in Stage Lighting Effect from Lights & Lighting on Aliexpress.com | Alibaba Group
Then, in addition to the projector you need 1) a DAC, a device that controls the ILDA interface via a PC, and 2) PC software to make and play shows
The cheapest option right now for these is probably a RIYA multibus lite DAC, plus ********* laser show software, which will run you about $200 including the DAC:
http://www.hingednewt.com/Pages/*********.aspx (the guy selling ********* also sells RIYA DACs for $100 if you email him). LasershowXpress is the next step up and highly acclaimed, but that starts at $130 alone without a DAC:
https://innolasers.com/shop/index.php?id_product=18&controller=product
You can also use my software, LasershowGen, to create shows for much cheaper, but I don't support DAC output yet, so you'd have to get another program to output the shows anyway, or load the shows onto an SD card and play them through the laser projector which is inflexible.
LasershowGen - ILDA / Laser frame creation tool
However, I am actually in the process of designing a cheap DAC which will make the cost of entry much lower for people like you, unfortunately it will be several months until it is formally announced and released.
EDIT: The word 5paghett1 is censored on these forums