not all GWPs are going for daft money - I know of a couple of top breeders who haven’t tried to cash in on the current interest in pups and are selling at reasonable prices but we’re still talking £1500 or so, but their pups are snapped up very quickly.
we have a rescue GWP from Bulgaria - arrived with us 5 months ago having been found as a street dog at the start of the year in an awful, malnourished state but brought back to good health by a rescue centre and then up for adoption through a UK Facebook GWP rescue group. we’re fortunate in that we’ve had a rescue GWP before albeit over 20 years ago so had a good understanding of the breed’s demands (they’re a strong, wilful, hunting breed that need a lot of exercise and good training) and that helped get us approved by the group admin (who has 4 GWPs). For info, he cost us £550 which included his pet passport (and vaccinations) and transport from Bulgaria (2 days) and some admin fees. But like all rescues you don’t know what you’re getting until they arrive - as it happens Troy is a delight but he needs a strong hand and a LOT of training, but we’re seeing some good results now.
Personally I’d avoid any of the “du jour” breeds like cockerpoos, cavapoos etc as they are just way overpriced and bred often by puppy farms. If you want a cross-breed (aka mongrel as that what these dogs are) go for a rescue - there are plenty of them in rescue centres looking for homes.
Rehoming with kids is always difficult as the rescue centres can’t guarantee the dog’s manners as they often have no history on them and kids and badly mannered dogs are not a good mix.
As @JaRok2300 says, there will be a lot of dogs coming up for rehoming once life starts returning to “normal” as their owners realise they no longer have the time to look after them and the fun of a pup has worn off and due to lack of training they have a big, badly mannered, costly dog on their hands. There’s a couple local to us training a very large, lovely black labradoodle bought as a pup for £3k by a couple in London - it’s now 18mths old, large and very boisterous with little training and the owners realised they have made a mistake. It’s being trained and will be put up for rehoming once it’s sorted.