Ken, I'd recommend the keltec ksg. It's a pump action bullpup and is completely ambidextrous. Getting little pricier around $600 but one of the best bullpup shotguns. Link here if interested.................... budsgunshop.com/product_info.php/products_id/74682/kel-tec+cnc+ksg+12ga+3+chamber+14+1 ................... If you want a semi automatic your best option would be the hatsan escort, link here...................... budsgunshop.com/product_info.php/products_id/131007/escort+hebt12180301+bts12+12ga+18+3+black ..................... If you're looking for a bullpup rifle the best/cheapest option would be the keltec RDB, the shells are ejected downwards and it's ambidextrous. Unfortunately any bullpup rifle isn't going to be low priced. Most start around a grand. Link to keltec RDB here if interested...................... budsgunshop.com/product_info.php/products_id/131891/kel-tec+semi-auto+rifle+downward+ejecting+bullpup+5.56+nato+17in.+green+black+20rd. ...................... hope this helps and good luck with your choice.

As mentioned, the Kel-Tec KSG is an ambidextrous model. Check out the specs with the link below.
budsgunshop.com/product_info.php/products_id/74682/kel-tec+cnc+ksg+12ga+3+chamber+14+1

Hi and welcome to the Buds Community Ken. There are limited options currently in Semi-Auto and in Pump Action due to popularity and being out of stock. There are compromises available but true left hand models are hard to find : https://firearms-texas.com/product/black-aces-tactical-pro-series-bullpup-left-hand-2/ -------------------------------------- Cheers and stay safe!

Hi Ken, the Escort BTS12 by Hatsan has a reversible charging handle and downward-angled shell deflectors for left- and right-handed use. budsgunshop.com/product_info.php/products_id/131007/escort+hebt12180301+bts12+12ga+18+3+black ,
Article here >>> gunsamerica.com/digest/escort-bullpup-shotguns-589-from-hatsan-new-for-2020/ ,
Stay safe & have a great day!