As a first time horse owner I would look into a good quality used saddle. Anything new
under $500-600 you are going to regret buying it. That saddle is very cheaply made, wont last, and I can guarantee that your horse wont like it either. Some brands to stay away from is king, circle p, double T and especially no name brands etc.
If you want a NEW SYNTHETIC saddle (they are cheaper than leather but you have to know what brands to look for) there are also nice brands like abetta, or cordora. They usually run around $350-$500. But these are built right vs the one you posted that isn't. Again you can find these saddle used for half the cost.
Some good LEATHER brands to look for are circle Y, tex tan, billy cook (the ones made in OK not TX) you can find them all reasonably price used like $300-$500. Obviously they can go higher on the price tag, but they are made to last. Where a good quality NEW leather saddle can run anywhere from $1,000 on up. Your horse will thank you in the long run when he isn't sore. I also suggest if you don't know your horses size to have a saddle fitter come out, they are very helpful and will get you on the right track!
To recap all of that: (it was a lot)
Do not buy a NEW leather saddle for under $500 its probably cheap
A good quality leather saddle can be bought for that price
A NEW good brand synthetic saddle can be bought for about $300-$500
A used synthetic can be bought for about $200-$300