*THIS IS NOT FINANCIAL ADVICE! DO YOUR OWN RESEARCH!*
The Algorand NFT market is flourishing with the rise of NFT's and because of the low gas fees to mint and transfer. The best marketplaces on Algorand to purchase or mint NFT's are Rand Gallery, AlgoxNFT, and AlgoGems. All of these sites give you a large selection of NFT's to buy, sell, and mint.
AlgoGems is an NFT marketplace that allows to either do zero-fee minting of NFT's or standard NFT minting. You can also purchase the platforms cryptocurrency $Gems token. You can tip with this token and that allows you to push an artists NFT into the spotlight so that more people see it. Owning the token allows you to take part in governance. Holders will also get special events, lotteries, featured drops, and fee reductions on the AlgoGems platform.

Rand Gallery is a more standard NFT marketplace on the Algorand blockchain. It has an extensive array of popular NFT projects. You can mint, buy, and sell in marketplace as well as see your gallery of NFT's in your wallet. Unlike AlgoGems, there isn't a crypto token associated with the platform.

And Finally we have the AlgoxNFT marketplace. The interesting thing about AlgoxNFT is it's shuffle mechanic where you receive a random minted NFT from a specific project at a specific price. Other than the shuffle mechanic, you can buy on auction, NFTs as well. Meaning that you might be able to get good prices for your NFT choices. Other than that, you can buy and sell NFT's on the marketplace.