I'll comment on your search for an English saddle.
If you're not in a hurry, then take a look at this thread and get an idea of what you can get at a great price. You have to be patient, and be ready to pounce. https://www.horseforum.com/horse-tack...budget-136845/
While it's possible to get something decent for under $100 incl shipping, you'll have much more to choose from if you can stretch yourself to $150.
If you're in more of a hurry and don't want to wait for a "steal" to come along, then:
Don't cave in and buy a no-name brand saddle. It's likely made in India or Pakistan and will do more harm than good both to your horse and your riding ability. Be aware that some Indian-made saddles do have brand names: Silver Fox, Derby, Lancer, Regent, Kincade, Foxcraft, Cambridge, Equiroyal...
If you're patient enough to hold out for a good saddle at a steal price, some brands to look for are:
Crump, Crosby, Collegiate, Stubben, Passier, Courbette, Sattlerei beim Kloster Schonthal, AG Felsbach, Kieffer, Wintec, Bates, Nice, HDR, pretty much anything made in England or Europe.
You can usually find some Argentine saddles on eBay in your price range. While not great saddles, they aren't awful either, and the wider trees tend to be fairly common in them. Brands are Cortina, Ruiz Diaz, and Rossi Y Caruso. Some Collegiates are Argentine. A few other brands as well. Be careful on eBay, since a lot of people measure the seat size wrong. Verify before bidding that they measured from the nailhead at the side of the pommel to the center of the cantle.
Here's one: 17" #487 Argentina Close Contact Jumping Saddle with More | eBay
This seat is measured wrong - it's probably actually a 17". Who knows what the tree size is... English Saddle made by Palaton Saddlery in England | eBay
Who knows how they measured the tree. Get measurements and pics from the front Used Rossi Y Caruso All Purpose Saddle | eBay
A little more money, but the gullet and stirrups are included: Wintec all purpose with CAIR panels and adjustable gullet. 17.5" | eBay
Looks fairly wide All Purpose Saddle 17" Made in Argentina | eBay
The Wintec is likely the best of these.