What is the best way to get cheap bifold door prices?

Well, a good start is to go online (like this) and do a search for prices for the door that you want, but make sure you have a good idea of the size and styling beforehand as it will narrow down your search somewhat.

Bifold door usually come in setups of 2 to 6 panel configurations, although if you have a need for them, you can get more panels.

One thing to look out for is the size crossover point for where you can use an extra panel. For example there are certain points where you may have an opening that can fit 4 normal or 3 wide panels and that will make a difference in price (the least panels being the cheapest option).

To see lots of useful information about all types of bifold patio doors and to get free quotes, take a look at https://www.cheapupvcbifolddoors.co.uk/cost-of-folding-doors/