Breeder will still likely charge north of £1k. Great looking little things but breathing difficulties common, plus many are forced to be born via c-section as skulls are too large for mothers birth canal.
Completely unnatural in these respects and therefore should not be bred in my humble opinion.
Was your previous breed a collie by any chance? Natuarally possessive and readily bonds with dominant family member. There’s absolutely no guarantee that any puppy you purchase will turn out any different to your previous dog. It has to be best to rescue a poor homeless mutt than pay a breeder hand over fist, surely?
If adamant on puppy, look at Boston Terriers. Hard to tell apart from frenchies to the untrained eye, yet much more sprightly and exercise able. Notoriously stubborn to house train though, apparently.