When choosing technology vendors, what are some of your non-negotiables or deal breakers?

1.Security measure of the product. 
2.Good Reputation. if new vendor, try to get into a strong support contract and check the financial stability.
3.Clear Support contract and SLA
4.transparency
5.cost or Value of the product

Non-compliance to our industry regulations, not agreeing to sign BAA
Not meeting our security requirements
Indemnification in shared responsibility model 
Unclear availability and disaster recovery SLAs
Unwillingness to negotiate support SLAs with penalties for not meeting the same 

Non indexed price escalators (e.g. they will increase their YoY costs to you by 5%). I am a proponent of shared risk and reward, so, using things like agreed to localized CPI for your industry makes sense.

Lack of flexibility in terms of quantities (e.g. you can always ramp up or increase quantities but you can never shrink them back down).

Unwillingness to operate in CDN currency (which is local for us) despite having Canadian offices. These firms tend to want to operate in USD, however, we've found over time, when the CDN had increased buying power, these same vendors then lamented it and asked for more. It is, in my experience, most often profiteering by them.

Attempts to charge us for access to their annual third party security attestations (SSAE, SAS, etc). Many of these firms need them to continue to operate or as a piece of their key sales pitch and factor in the cost of having them done annually,so, why should my firm then have to pay to see something you've paid for?