Couple options for pickup, this far out you could probably cancel your order. I don't think Meyer has a cancelation fee except in cases of excessive cancelations if you cancel more than 1 week before your hatch date. Then you could order your chicks from the hatchery in MD (unless of course the blue cochin is a must have for you like the lav orps)
The other option is to keep checking Meyers' website for the orps. When we placed our chick order with them last January one of the breeds we wanted wasn't available for our hatch date. With no chickens of my own yet, I kept impulsively checking the website and about a month before our hatch date I noticed the breed we had wanted was now available for our hatch date! The customer service team was wonderful to work with and it was no trouble at all to change our order.
You could also check the cancelation policy for the other hatchery and if it seems acceptable place your order at both hatcheries and cancel your order if the orps become available at meyer