Without being taken advantage of, make every deal look good on you. The value of honor in trade is worth the petty costs of considerations and courtesies.
Never burden the buyer, in fact, cater to them.
Let the kilo buyers dollar equal the 5 kilo buyers dollar, ie, give the same quality and service level regardless of ticket weight.
Usually, the snobbiest, pickiest, most particular wierdo -
has the best stuffSet out to have triple or more of what you offer on hand. Stuff happens.
When your client is out, it is hurting your sales. Don't let loyal regulars be out due to error on your part or a common hazard of trade. Put the groceries on the shelf and invoice or nobody is selling for you and your client is looking for better partnership.
If a client is regular and successful, consider loss sharing even though you don't have to. Calculate how many sales will make up the difference and let your goal be to have the continuing orders, not the "one time" petty % of profit.
People like same day/next day turnaround. Get it done. (Or the gods will kill you...)
People like free shipping.
Due to amazon and ebay it's gotten to be a thing. Work it into your pricing or charge a small flat fee that is obviously cheaper than it would normally be. "$5 flat rate" is the next best thing to free.
Never treat a botanical irreverently. Nutrition, health and wellbeing are the most serious business and substantive quality is coveted. Buy the best and gloriously describe why it is.
Keep a "market" deal for the economy shopper and be ready to sell any weight requested by gram. Pilgrims are not big buyers, but they are big talkers and appreciative free advertising.
People buy when they need to, but they move in where they feel confident. The client's image is as important as yours in building repeaters.
When you get the bum load, mark it down accordingly, describe and get rid of it. Get to the next load. You can lose more money trying to prevent a loss than simply "cutting your losses" and moving on as quickly as possible. Don't try to hold on to a hot potato.
Balance "every-single-penny" with "look at it like playing a sport and enjoy the play" especially in the beginning when it is new and you need a few adages to help keep your wig on.