Corrected entry: Meredith claims she is sleeping with the supplier of Hammermill products for the branch to get discounts and has been for six years. But Michael only got his branch to be able to sell their products in episode 3-2 "The Convention", two years earlier, so this is impossible.
Correction: It's also possible that the rep she was sleeping with was not with Hammermill for the entire six years they were sleeping together. He could have easily been with another product line during those six years.
Correction: She doesn't mention having slept with him specifically for the discounts, she also mentions that she gets Outback Steakhouse gift certificates. The only logical conclusion is that she had been sleeping with the rep primarily for the coupons, and then added on the discounts to the supplies when he just happened to become their supplier.
Knever