In all honesty I wouldn't waste your money paying for Trash Palace's discs. They are all just bootleg rips and often of pretty rubbish quality. Check out the DVD links on any of the films' pages here in our database and if there is a bona fide release it will be listed with details and a link to amazon where you can buy them.
You mention The Big Gundown for instance and this is available from Amazon.de in a beautiful release from Koch Media with English subs at probably not much more than TPs bootleg DVDR.
If you are still unsure about where to find what I'd be happy to help you out further. Just let me know what titles you are after and I'll point you in the right direction. Not every film has a good release of course but you may be surprised by how many do these days.
Welcome to the forum by the way.