Is it me or is the motel in 'Bloodlust' and 'Monster at the end of this book' film in the same place because the vending machine the boys get their drinks out of looks the same as does the location....

They often use the same locations to film different things, most shows do. Just like the different hotel rooms are the same set redone over and over again. The abandoned mental hospital in "Asylum" and the hospital in "In My Time of Dying" were both filmed in a nearby mental hospital in Vancouver that was closed down. I'm pretty sure it's been used for other things as well. They rarely travel madami than a few hours from their homebase to film anything. They use the same stretch of road over and over again to represent roads all around America. It's why we'll never see an episode set in Arizona. There's no saguaros in Vancouver! =D They work on a budget after all.

Vending machines tend to look the same....

they tend to use the same props