Because its going to get asked...is there a specific TS model you are looking at as well? i.e. TS9 or 808 etc.
My recent favorite has been my Wylde Overdrive. If you get a used one, you may be able to mod it to be switchable between its stock form and the MXR GT-OD. They used to install the same PCB in both boards and flip a switch on it depending on which enclosure it would make its home. With my Les Paul, I use the GT-OD form, and my PRS SE Custom sounds much better with the Wylde Overdrive, which scoops the mids a bit more for a very crunchy rhythm tone. So basically, you're getting two for one if you buy that pedal.
I think they got wise to it in later revisions and stopped doing it, but I'm not sure how to tell the difference. Maybe the ones that say Berzerker Overdrive no longer have that option?
Do not overlook the digitech/hardwire tube overdrive. fantastic ts type pedal with some tweaking option s. I think the are discontinued but try used.
My fave is probably the old TS10 I used for years bitd.
I don't think it was the Wylde OD, but I know that the MXR Classic OD did and can be had on Reverb right now for $50. I bought one from GC for $40 brand new (I think they were on sale) and my dad and I modded it so that the switch is on top of the pedal and I could switch it when I pleased.
I would definitely look at one of those on Reverb. If you can score one with free shipping and are handy with a soldering iron (or know a great tech in the area) a great dual mode OD/ TS clone can be had for $60-75.