Yeah,when I buy these flashcards,I wiil compare the price in many sites, and choose the middle price,neither the cheapest nor the expensive.
Price isn't a good indicator of quality.
You may take note that marketing psychology works both ways.
Some companies price things "low" to get the people that always go for the cheapest product.
Other companies purposefully price the same things "high" to get people to make the assumption that "its more expensive so it must be better".
There are numerous experiments and tests that show and prove this. Slap a higher pricetag on something and a lot of people will "assume" it has to be better/higher quality.
I've seen two notable ones:
One had a furniture store that had two identical chairs (those luxurious fancy chairs), one with a $200 and one with a $300 pricetag standing next to eachother.
They asked people, and everyone said the $300 one was "more comfortable".
Overnight they switched the pricetags and the next day the $300 one was again more comfortable.
Similarly I've seen one with photocamera's. One using a small digital camera and the other had a small digital camera hidden inside a casing to make it look like one of those expensive camera's you always see in photoshoots. Everyone assumed the higher quality photo came from the 'bigger' camera. Because clearly that one has to be more expensive and better right?
Suffice it to say - its always best to do your homework and simply cross reference product and store reviews.
Hell, throw in some of the shopnames like yeahgeek or eachmall into the gbatemp search engine and you could probably find plenty of examples of people that used them.