you can get working units and spares on this site and flea bay. There are a number of MKT experts here and believe me they have trouble shot and seen it all. Spare parts are readily availible just run a MBU 3 search for the V 3s MBU 2 for the twos, I had two brand new never fired twos , I converted them to propane (LPG) for about 40$ each with direction from a Steel Soliders thread, look the same , much safer. I have had good luck buying 3s I bought 4 for 100 dollars each free shipping and only had troubles with one . It just needed a 58$ compressor . The 3s run great and are simple to use easy to trouble shoot and fix. I have a complete USAF Desert Tan tarp MKT. two M 59 field ranges , V3 Burners /Huge griddle top . utensils, coolers , the works. Spent about 6 months cleaning , repairing and restoring it . Suddenly not needed, change of plans. Retired and decided to snow bird in AZ So your in the right place for MKT info and support!