Can I order Rosco Gobos to fit accuspot 250?

You would need to ask Rosco. We can't say if they will work or not.

but usually if they are the right size they will fit and should work pefectly.

You can go on rosco's web site to find out, you don't need to ask them. They have a list of standard sizes they offer.

I would personally go for an Apollo gobo however, just b/c I like them better hah.
http://www.internetapollo.com/Products/PatternGroupView.aspx?groupid=Holidays

Check out there selection, very nice stuff. Yes they will fit in your Accu Spot 250 and they cost about $20 shipped to your door. All you have to do is slide it in.

Let me know if you need a vendor, I may have a guy

-Homeboy