If you want time to decide
Underdog Rips gives 3 days before a card sells back automatically, except $1 packs at 60 minutes. Packz gives 72 hours under its current rules. PrizePicks Packs gives 24 hours from opening.
Shorter clocks aren't worse in themselves, but they punish anyone who rips and walks away.
If you want the sell-back paid in money you can withdraw
Packz pays buyback proceeds to your bank. Rips by Triumph lets you withdraw sale proceeds to a debit card, bank, PayPal or Venmo after identity checks. Tilt Rips sells back at 90% of live market value with no extra fees.
DOPA, Packs.com and Drip Shop Live pay sell-backs as site credit, which only buys more packs.
If you want Japanese Pokémon or One Piece
DOPA shows the full prize pool and odds for each pack and focuses on Japanese Pokémon and One Piece, but converts unwanted cards to credits only.
Collector Crypt runs machines of graded Japanese Pokémon and One Piece slabs with a buyback of 85% to 93% of insured value, paid in USDC, if you're comfortable with a Solana wallet.
If you want real cards shipped
Drip Shop Live ships pulls from Instant Packs and live breaks. Packs.com ships raw Pokémon, One Piece and Magic cards, with an estimated 2 to 4 weeks for delivery.
Whichever you pick, set a budget before the first rip. Every site here sells random packs, and a pull worth less than the price is the normal outcome.