Do you have access to RFDTV? Parelli and a number of other clinicians/BNTs (NH and otherwise) have weekly tv shows on that channel, if you can weed through the polka programming...
IME, Parelli's is one of the ones that is more infomercial than exposition of useful training technique anymore, but there are nuggets of advice that can be extracted here and there.
Also, check with your local library -- some of them, if they are big enough, have some training books and videos/DVDs to lend out. Never underestimate the power of interlibrary loan, either. If they don't have it at your local branch, your librarian may be able to get a copy for you through another location.
Some horsey magazines offer features with training exercises, concepts, and advice from big-names. Lots of libraries carry subscriptions to bigger magazines like Horse Illustrated or Horse and Rider. I've scored heaps of back-issues at garage sales over the years for a fraction of the newsstand price, and training information really never goes out of date.
I've heard of a service, similar to the Netflix concept, that carries only horse training DVDs. I think it's called Giddyupflix. Might be worth a look-see, if you can watch enough DVDs a month to make it worth the subscription. I haven't personally ever used it, but maybe someone who has can comment on their experience.
Ebay, Craigslist, and similar places sometimes can be great ways to get used materials for significantly less than new
Don't overestimate the value of a logo -- for all intents and purposes, a rope halter is a rope halter. You can buy one every bit as serviceable as the one Mr. P sells at TSC or your local tack shop for $5-10 US. Same goes for sticks and lead ropes. Or, better yet, learn to make your own -- you can customize your own tack to be the materials that feel best to you and your horse.
Of course, as always, working with a trainer who is getting the kind of results from their horses that you want to get out of yours is the best way to go to make the most progress in the safest way. I understand that trainers are expensive and you're looking for low-cost options, but you never know when you might be able to barter stall-cleaning for lessons.