Are there good resources that cover franchise acquisitions ?

I've noticed that many of the brokerages and broker aggregators (i.e. BizBuySell) seem to have a disproportionate number of franchise-related listings while most Searchfunder content focuses on traditional independent firms.

There's obviously a downside to not having total autonomy and splitting profits with the parent organization. However, it seems to carry lower risk with more support and (depending on the franchise) name-brand recognition.

On a related topic, is there a big secondary market for franchise territories? I am totally unfamiliar with how that works. Do the parent organizations typically take cuts of franchise sales as well?