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This can be, easily, corrected! Just prune off the growth that is heavily affected. It will recover on its own, as long as the conditions remain favorable. Here is an article that will help you with the care of your plant:

https://www.gardeningknowhow.com/edible/herbs/oregano/learn-how-to-grow-oregano.htm

I'm sorry, we do not offer specific places to purchase. I would check your local nurseries or online. They may have what you are looking for. What we can do is offer care of their growth:

https://www.gardeningknowhow.com/ornamental/flowers/mexican-bush-oregano/mexican-bush-oregano-growing.htm

It is hardy in US zones 9 to 11.

https://plants.ces.ncsu.edu/plants/plectranthus-amboinicus/

We don't recommend vendors or products but here is more information on the plant:

https://www.gardeningknowhow.com/ornamental/flowers/mexican-bush-oregano/mexican-bush-oregano-growing.htm

Oregano typically flowers when it reaches maturity, responding to environmental cues such as day length and temperature. Longer days and warmer temperatures, characteristic of late spring and early summer, stimulate the flowering process. Day length is a crucial factor, with the transition from shorter days to longer days triggering the initiation of flowers. Environmental stress, like drought, may also prompt oregano to flower, as the plant perceives stress as a signal to reproduce. Adequate nutrient levels, particularly phosphorus, play a role in encouraging flowering. Pruning can potentially result in bushier growth and increased flowering, but excessive pruning may stress the plant. If you aim to control flowering, manipulating day length through artificial light or adjusting growing conditions can be effective.