I'm not sure if this is a better question for the corral? Are you asking mostly about regular release G1 ponies? I'm guessing it's a fact finding mission
Standard release G1, loose ponies can go for between $0.50 and $600 or more. The price depends on the pony, its condition and its desirability. For example a common, easy to find G1 pony, Peachy for example, in poor condition can go for $0.50, in nice condition her top price might be $6. If you have a sort after, hard to find and popular mail order pony, such as Rapunzel, in pristine condition she can easily fetch $600.
Many thing have an affect on pony prices. If you get a number of people liquidating their collection it can decrease prices, if a sudden supply opens up it can decrease prices. If demand out reaches supply this will push the price up. Fashion is a factor too, the popularity of The OC sent Princess Amethyst's through the roof a number of years ago
You also have to bare in mind where you buy can affect the price you pay. I have noticed that there is quite a difference prices between eBay, Facebook and Instagram. Don't forget you can find ponies in second hand shops and boots sales or flea markets. You can get lucky and pay pennies or find they are way over priced. Bidding wars and other things can also mean you can pay over the odds.
Now, nirvana ponies, what I said above can be applied exactly to nirvana ponies and you can expect to pay anything between $0.50 and $10,000 for a loose pony. Yes, you read the right, $10,000
Prices depend on the pony, its condition and desirability
I've said all that, but there are
plenty of G1 ponies that can be bought, in nice condition for under $10 and there are a fair few nirvana ponies that can easily be bought in nice condition for easily $20
Just because it's G1 or nirvana doesn't always mean it's expensive
Love pkw xxx