Unfortunately the best discount the garden centers around me will give is 10% and that's with no plant warranty. If I buy full price I get a warranty but then I get charged 6% sales tax as well and I have to tax again when I sell them. Usually I buy my stuff as tax exempt and the tax is charged to the customer when I resell. Some materials they discount a little more than 10%, but a 10% markup just doesn't cut it for me. I do better on things like grass seed which I buy in 50lb bags.
For large orders like the 98 plants you had, I can get direct from a nursery at a really good price but can't select at all...you get what they give you, so I order a few more than I need. Basically you pull in and they load you up...you can't even help.
WOW
I think you need to shop around, at 10% sounds like that a home improvement store. " Lowes Home depot " we have several suppliers, " it's a MUST" if they wont give you wholesale prices move on. 10% is nothing.
I see your issue, it's hard to make a living at that.
landscaping/lawn service is not unlike any other business IT's a MUST that you make and keep business contaics.
knowing the people who have the right products can deliver, and sell to you at wholesale prices.
do your slef a huge favor and shop around TODAY, call every nursery in your area, and demand wholesale prices.
best of luck