It seems like this DVD set might be what you're looking for? The Complete Collection was released back in 2009, and I've found it for sale on Amazon and eBay:

Amazon: https://www.amazon.com/dp/B002DQSKLU/ eBay: https://www.ebay.com/itm/115615882517

I think the $5 or so, $8 on Amazon, for the original series is quite the bargain.

http://ecx.images-amazon.com/images/I/915MZ9JxGuL._SL1500_.jpg

http://www.amazon.com/Ultraman-Complete-Series-Susumu-Kurobe/dp/B002DQSKLU