Paul Sellers recommends a 12” tenon saw with 14-16 PPI. You can get brass-backed or steel-backed ones, the steel-backed saws are slightly lighter in weight so it is down to personal preference, however Paul says most experienced craftsman ultimately use a brass-backed. 🇬🇧/🇺🇸You can buy these new online for approximately £30-40, we found this Spear and Jackson one on Amazon which can also be ordered from the US. Paul suggests that as a beginner you buy a new one of these until you feel confident enough setting up and sharpening a secondhand one. When you are ready for that, look on eBay for brands such as Spear & Jackson, Garlick, Pax, and Disston . When buying a second hand saw, both a steel back and brass back are good. Ensure there is no severe rust corrosion like pitting as this can result in hole through the saw plate, most light rust can be sanded away, also check that there aren’t a lot of teeth missing (more than 4 missing is too many).
We purchased this from eBay for £18.50 with £3.80 delivery.*
*Prices correct as of December 2017