As part of the obligatory RFD posts, costs: Peglyte laxatives. These are kept behind the pharmacist:
$36.99 Shopper's Drug Mart
$18.99 Costco [user submitted]
This Peglyte thing comes in a 4L empty bottle with powder at the bottom. You fill it up with water at home.
The prep can be seen as awful. You have to drink 4L of this Peglyte shit the day before. You'll be spending the entire 2-hour Peglyte consumption interval on the toilet (and there are 2 of these 2-hour intervals where you drink 2L each time). You can't eat, but you can take transparent fluids like apple juice/non-coloured Gatorade, which is no problem. Since I'm fat, I decided not to consume any energy sources for 36 hours (from the start of the prior day to end-colonoscopy). The Peglyte tastes like saccharin-laced Gatorade without the fruity smell or tanginess. Not bad...unless you have to drink 4L of it.
I went to the clinic; they stuck me with a hand IV. When I was in the scope room, they told me to lie on my left side and skootch over to the end of the bed, and I remember waking up with no pain/cramps/anything - though apparently, I got an opiate dose? Pretty pleasant experience overall because I remember none of it. The anaesthetic used was propofol, which felt pretty clean for a knockout drug. I woke up slightly dazed, but it was gone within minutes to an hour - I felt fully functional...?. They say you can't drive for 24 hours after the anaesthesia. This particular clinic makes sure you have another adult to transport you back.
All in all, I was in and out in 2 hours. Most of it was waiting.
So don't be afraid to get one of these if you get a screening request. Colon cancer is the 4th deadliest cancer, but it's easily detected/screened as a mitigation measure. It also takes years to develop so you have a fighting chance. Sometimes they'll just cut out polyps with the colonoscopy probe (polyps can become cancerous after a few years).
Edit: The only concern I would have are the risks they outline in the consent form. They will repeat it to you during the procedure. Odds are low though 1/x * 10^3, but every medical procedure is obligated to report risk to obtained informed consent.