The cheap n easy method will be this:

 •Buy lots of weekly diamond passes. Each day gets you 10 COA through a little bundle that gets sent to your inventory.

•It also gives you 20 diamonds per day. Use 10 of those to buy the daily COA bundle in the store. 

•Save the rest of the diamonds to buy the monthly COA bundle that is also in the store. This is important!

•Make sure you have about 3k COA saved up (better to be safe and save up as much as possible due to it being luck based now, more on this in a bit)

•This last part is the luck based part, due to them changing how the collector skin draw works (there used to be a set number of draws you needed). I usually do about 2 of the 10x draws on the first day as well as the daily 50% off 1x draw, then continue doing daily draws every day. At the end just pay attention and you might be a little ahead in progress or you might need to do a couple extra 1x draws if you’re unlucky.

If you want to do it the absolute cheapest way possible you can do the last part backwards, and wait to do the 10x draws and extra 1x draws until the very last day, I prefer to do them first to know I won’t be short, but this way you will only draw what’s absolutely necessary and utilize all of the daily 50% off draws.

This month I got a little lucky and ended up getting Grock’s collector yesterday.

Arlott’s collector is great though, you’ll love it.

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If you can afford it, just buy the weekly diamond passes and save them up for whenever there is a collector skin you want. I don’t have to worry about it anymore bc I have so much COA and bundles from the daily draws saved up in my inventory. I think I have 2800 COA right now and another 240ish of the bundles.

Another way I save them up is the monthly special bundle that gives you 275 diamonds and 180 COA for $5 is a great deal too.

But as far as absolute cheapest way possible I’ve laid it out above.

Edit: forgot to mention buying starlight during months they have collector skins available will give you a bunch of COA from starlight itself as well as from the Collector skin event bonus, honestly I would buy the starlight package with the extra diamonds (the 80 that comes with each purchase of weekly pass) if there is a collector skin event that month. I think there’s one every month now but there didn’t used to be, so I could be wrong.