Targon can't be contracted like other products on the main worlds in that sort of 'set it and forget it' method since the corps that produce it are on a different world. Having said that, I've got a couple options that I can offer.
If you want some direct, obviously a manual trade for a large enough quantity to get you through for a while before needing more again. For 2 battery and 2 missile corps, That's just shy of 1k per turn so ~ 180k per month would be full supply, I'd have no problem providing that in direct trade and you'd just likely have to DM me (discord is best place) when running low and I can top you off again.
Another idea but it relies entirely on my memory and I do have tons of obligations outside of the game, is just make a big manual order with your country at your convenience, and I'll make a conscious effort to try to go through each of the worlds over each weekend and sell do
I think direct sales over time would suit me. I can PM you when I'd like to buy next shipment.
Having gone over the production numbers I think 2 corps producing 1 battery per year and 1 missile corps producing 2100 missiles a year will be enough. The supply needs for those are 775 Targon per month
775 X 12 = 9300 per year. That's 2 real days worth. For 30 days supply ie 1 real month
9300 % 2 = 4650 x 30 = 139,500 per sale. 1 real month supply per sale would be ideal. That way I wouldn't have to bother you with PM's so much.
Really appreciate the offer
Thanks
Country Mercia FB