Movit Gymnastics Ball »DYNAMIC BALL« with Pump, Sitting Ball 55 65 75 or 85 cm 7, Load Capacity up to 500kg, Anti-Burst Material, Fitness Ball

My wife wanted a gym ball during pregnancy and this was the cheapest option with decent reviews. It did the job but the pump to blow it up broke quite quickly and she ended up always sitting on it half deflated (it’s possible to add air by blowing into it but obviously not that easy or efficient to do so).

Yes

pump didnt seem to work with it.