I have one and it is a great phone, camera great too, battery life 24hrs, recommend!
Market is poor for tech goods currently unless it's PC parts. You'll have a more difficult time shifting a phone over the Summer. You'll need to be patient as people are waiting on the restrictions to be fully lifted then go literally mental over having a holiday so the money is waiting for the holidays etc.
paid 100 for one 6 months ago. brilliant camera
Qwikfone selling 'like new A+' 3a xl's for £142 delivered (was £135 a couple of weeks ago but I think they've sold a fair few of these so have pushed the price up). Cannot post as a deal on here as they don't have enough Trustpilot feedback yet (has to be 500+ ratings apparently) but the feedback they have got seems pretty good for what it's worth. Just another option for those interested in this model.
in which case i'd use ebay, even their crazy fees (when no promo is on) you'll at least get a sale even if you come out with the same price after fees