All my BFRs have been with a club instructor. Reckon on the cost of an hour's groundschool and 1-1:15 dual at club rates.
I have managed before now to combine it with a rental checkout, but only when I'm fairly current in US airspace/RT/locality. If I've not flown in the USA for a few years, realistically they need splitting out because I do need the extra time to re-acclimatise.
I'd recommend budgetting for 3 hours for your first BFR + checkout if you've not flown in US airspace before.
G