I use a card keeper.
I have a potato camera. Look for the red box, thats the card keeper. I like it a lot.
I got a couple of these, if you live in the US I could ship you one if you pay shipping.
Doesn't work with all cards, you have to have the circuit board accessible for it to clip to and you might need a different, longer pci slot screw
You can also try things like a unsharpened pencil or a chopstick or try hanging your PCI-E power cable from above so it lifts the card. I used to use zipties but I didn't like having to cut the zip ties to remove the card.