I don't know, how much did you pay for the Sphinx? If the answer is less than 5-10$, then sure.

I wouldn't pay more than 15$ for a Gorgon, that's for sure.
Air Pressure Gorgon's are actually pretty nice guns in terms of power, with the exception that the pump is... difficult. The Hydro Power version is more or less the same, sort of less power but you can fire it upside down XD
And to make this post legit:

I went to both local VV and Talize, found this SC 600 for 4$. No stickers, some green goo jammed in the res. cap, and only a tiny cracked chunk of o ring left, but otherwise it's good.
*EDIT* The pump seal on this is a little bit loose (I can fix that), but it still functions well. It's a great little gun.