With Pearson, I've found that if you buy the lab access code, you generally get the ebook included, though you might have to navigate a little to find and use it. The last Pearson class I did there was a navigation menu on the left with something like "text" as one of many bullets in there. I never would have found it if I hadn't been hoping so hard that I didn't have to drop another hundred on the book. Pearson usually offers a couple weeks of free trial, so you could always start with the free trial, see if you can find the book on the lab access site, and then buy/rent the cheapest combo available based on what you find. Or do all your homework at once during your free trial and never pay for the lab access.
With most texts, you can rent the book from Amazon and have the option to do either etext or physical book with or without the access code. Renting books on Amazon has saved me a small fortune in textbook fees, especially if you're willing to be flexible. Sometimes the physical book is cheaper, other times the digital version is. I got my $150 operations management textbook for a $19 ebook rental this semester :)