What is the most useful and cost effective Anker product, whether it is the battery pack or selfie stick?
Best Anker product to buy on a budget?
Would depend what your in the market for as to what you would buy.
Personally if I was on a very tight budget and was after a battery (for size and emergency phone top) up I would probably go for this
https://www.amazon.co.uk/dp/B00P8SY7HQ/ref=pdp_new_dp_review i just recommended this to another dude in another thread. i thought you might find it useful too. like i told him, i get to charge my iPhone 7 2.5 times before it dies out on me. its an incredible little device
If you are on a budget, I’d say the best product to buy would be whatever you have a need for.
If a different product, that you have no use for is on sale for $5, would you buy it? Yet if you needed a power pack and found for $15, perhaps that is what you truly need?
My apologies if I’ve misunderstood the question.