Price probably went up due to heavy demand.

Here's a new one on ebay for $25, shipping included.

https://www.ebay.com/itm/NEW-SODASTREAM-JET-SPARKILING-WATER-MAKER-CO2-NOT-INCLUDED-IN-BOX/183588181182?epid=9018338820&hash=item2abeb554be:g:1qsAAOSwG1JcFbM4:rk:1:pf:0&LH_ItemCondition=1000

..or refurbished on Amazon (with 90 day warranty) for $19.17

https://www.amazon.com/SodaStream-Sparkling-Carbonator-Certified-Refurbished/dp/B07K3NVGZ5/ref=sr_1_2?s=kitchen&ie=UTF8&qid=1546023781&sr=1-2&keywords=sodastream