I purchased this compressor from Alibaba.com because it was MUCH less expensive than any others I could find. That, plus the fact I didn't have to buy an AC to DC power supply with it, made it a no-brainer (I already have a power supply for use with mains current). The sipping cost wasn't prohibitive and the shipping time was not bad, but it feels like I got the item faster than expected. Thank you Alibaba.