There is a difference between oral and sublingual and the price difference is very small. I know of a lot of bad information out there saying to take upwards of 100mg of DHEA and I'd recommend researching more.
There is a reason I always say to know where you are starting from because it is the only way to know if you need it and how much. If pregnenolone and 5mg of DHEA are bringing my numbers to ideal levels and has changed mood, memory, libido, and energy, there is no reason to take more than is needed.
Again, backfilling for a short period of time is one thing, but high levels of DHEA can cause sides like acne, heart rhythm issues, possible hair loss, low libido, and insomnia.