Your Ithaca model 66 super single which was made from 1963-1978 is valued at between 55-100 dollars based on your gun having between 60%-95% of its original finish remaining and a decent bore.
Try Numrich Gun Parts Corp.
It can be suppressed, yes - any firearm can be.
Yes, some of their varminters were made in single shot,but they only made a few and they are very difficult to find.
Look in your library for a copy of The Blue Book of Gun Values. You'll find information on hundreds of single shot guns.
Professional appraiser
200-500 depending on where you live
Try e.gunparts.com
Model 053-Single Shot,056-5-Shot Magazine,066-Tube Magazine,083-Single Shot,084-5-Shot Magazine,086-Tube Magazine,15-Single Shot,15Y-Single Shot, 419-Single Shot,48-Single Shot,49-Single Shot,50-Single Shot,51-Single Shot, 52-Single Shot,53-Single Shot,56-5-Shot Magazine, and 66-Tube Magazine. EXC. $--, V.G. $200, Good $100, Fair $70, Poor $50
TRY ... http://www.gunstocksinc.com
No sn data published
In Australian dollars around $50 to $100 in good condition. very good super reliable shotgun.
Single shot? Rolling block?