Fear not, with EZ Sticker Farm™ strategy you will get all your stickers and then some in no more than 30 minutes!
(Results may vary, the writer of this guide is legally not responsible for different results and/or loss of sanity)

EZ Sticker Farm™ strategy relies on a clever use of a game mechanic, namely: you can never have 2 of the same item!
That's right. No matter what, if you have an item on your table, the game will absolutely NEVER make a second copy of that item appear on the band. So with this in mind we will exploit the game use EZ Sticker Farm™ strategy to set the table up in our favor, in no more than 5 simple steps!

Step 1: Start a new game in Chill mode.
Step 2: Do absolutely nothing to satisfy the needs of the poor souls who desperately crave their lost belongings.
(And by do nothing i mean do nothing, just pretend they are air. Remember this is chill mode so there are no timers, they will just stand there all day like lemmings.)
Step 3: Fill up your table with one copy of each item. Throw every item that can have stickers on them in the trashcan (after you rip those little f&@*!ers from them of course).
Remember: we are Chill Mode Andy™-s so we lose no money by throwing gaming laptops in the bin. (LOL?)
Step 4: ???
Step 5: PROFIT!

If you did everything right now you have a table full with 1 copy of every item EXCEPT: Luggage, Gaming Laptop and that other laptop (forgot the name and i'm too lazy to launch the game to check.)
Meaning: every single time the band rolls the game will ALWAYS give you the following 3 items: Luggage, Gaming Laptop and that other laptop thingy(?).
That's 9!, yes you heard it right 9! stickers every ~20-30 seconds!
Now it's only a matter of about 30 minutes and you are done! (Well that's how long it took me anyway, your results may vary. See legal disclaimer above.)

P.S.: If you can't fit 1 copy of every item on the table because it's too small you might have to *gasp* actually play the game normally until you can afford a table upgrade or two (and don't forget to pay your family too, or else...)
P.P.S.: regarding chill lemming mode. As i have said earlier the timers are a non issue, your valued customers lemmings will just stand there all day demanding an item that you have
(which you will a-b-s-o-l-u-t-e-l-y NOT give them, remember we are not here for THEM, we are here for the STICKERS!!!!!!) HOWEVER: if you accidentally give your valued customers lemmings a wrong item, you will lose money and gain heat. 100% heat = game over, even in lemmings mode. So make sure to take care when throwing those gaming laptops in the bin (LOL), or you may accidentally anger the leftmost valued customer lemming.
P.P.P.S.: If you are missing the bomb defusal achievment, you can use this strategy to target farm it. Fill up your table with all item's except the combination lock case and 2 other items. Result: you will get a combination lock case every time the band rolls. Enjoy!
P.P.P.P.S.: I uploaded a screenshot of how things should look if you did everything right.
That's all folks! Take care!