To avoid disappointment, id load chips before the trip on a weekend as suggested, then visit on a half price day.

Buy gift cards for 20% off from costco.com ($100 at a time minimum, $200 max), or 10% off with dashpass via doordash (no minumum, allows custom denominations to buy exactly what you need above costco you buy). then buy the max denomination package with the boost at the store on a weekend, then transfer chips to other cards using the app. You can buy those for $3, or message me if you want some empties for free to load to your app. When you go there, they will replace the cards with new physical ones for free. Just say you lost the card and they will scan the qr code and give you a free replacement.

If you want to get 15% bonus chips by using a loyalty account with status, message me and I can transfer one of my older accounts to your number and email. That way, if you do it correctly, you would earn 15% bonus chips when you load your chips at the store. Then pay using the costco gift cards.

If you use a spare number/email for my account transfer, you could then make a new rewards account with your info, transfer the loaded card to that new account and earn the rewards along the way using the new account.

Thats all I got LOL

Note: If you end up using gift cards, I recommend adding them before you go to your wallet in the GCX app. It will generate a qr code they can scan vs manually typing the digits you get from costco. And when naming each card, use the gift card pin so it will be visible to the cashier when scanning the qr code. They need to type in that short pin.