Contracts

I have been bringing craft items to a local consignment store. I originally signed a contract stating that I must pay a monthly fee and update my items. They re-mark my items for 25% more than my asking price. Over the 10+ years I have brought my items to the store, the store has had 3 different owners. I have never signed a different contract or been asked to do a new inventory with the new owners and had no input into the sale of the business. Now I have terminated my association with the store. Several items are missing-$450 worth plus $40 worth of broken items. The current owners paid me $175 for some missing items, but their lawyer says they are responsible only for the items which I brought in since they took ownership. I thought since my contract is with the store, it shouldn't matter who the owners are-the current owners should be responsible. There is no mention of reimbursement for lost/stolen items in the contract. Is there any way for me to get my money ?

I am starting a business offering creative designs for the home and office. Some of the items (plants, silk arragements, and other commissioned art pieces will be incorporated into the designs. I will research other artists work, commercially or personally and need to have a contract stating that there are no returns, who is authorized to approve, and payment terms, and fees for my services etc.

What is the difference between a technical breach and a material breach? What is the Doctrine of Mutuality?

Is there a rescind / cooling off time on a purchase of a new vehicle?

I currently live in a residence owned by my mother. She accepted an offer in writing to sell the property. She changed her mind about selling it,but the buyer is now suing her for breach of contract. Is she legally bound to sell now? Will a judge make her sell it? Also I am getting ready to renew my lease. If she is forced to sell it, do the new owners have to comply with the lease, including the monthly rent amount?