Is there fabric vendors?

Very little

Yes but not a huge variety of different places

Sparingly yes , generally with household stuff and garage vendors . Spring valley tends to be better for that sort of stuff if you havent been . It's also a good time I recommend it . A lot of legit resellers and vendors as well not just garage sellers

Sometimes on sundays.

Not often usually remnants in the garage sale areas

I have not seen specific fabric vendors there. Just remnants in some areas where misc household goods are being sold.

Yes, but not always. Mostly Sundays.