The worst part is I sold the house for a 1 or 2% discount from the market.

A couple of things that you can include in your contract is a discount of a few dollars if they pay early as well as a late fee!

This allows me to buy in bulk and take advantage of discounts.  

Discount the expected maintenance along a time line  as well as capital improvements on your rental and before tax assessments.

I submitted a bid to Prodesk in Home Depot and got a nice discount for 2500 sq ft of it.

If someone does buy in normal day-to-day life, they do so at deeply discounted rates because someone who made an impulse buy under the high pressure tactics wants to unload it, often times because their maintenance fees were hiked up.

SFH 3/2.5, 2 car garage, Built 2008. 2074 sq ft Asking Price- $99,000Purchase Price (20% discount)- $79,200 ARV- $140,000 (going off comps and similar properties) Appraisal website says its market value is $131,900.

It is for a rental so I'm searching for something new that is discounted or used in good shape. 

With a relatively minor amount of work it is likely to attract owner/occupants with a smaller discount than a flipper requires.If the numbers are this:100K purchase40K repair200K ARVA hard money lender will likely lend 65K on it. 

So, a lot of the negativity is hearsay that gets passed around  Not discounting those here who have had bad experiences.