Two things:

1.  Middlesex Conservation District plant sale in April.  Follow the link for plant availability.  Small plants.  Inexpensive.  Nice selection – a number of species (including natives) I wouldn’t expect to find in local nurseries:

The Middlesex Conservation District will be holding its annual Spring Plant Sale on Friday April 26 (3-6pm) and Saturday April 27 (8am– noon) at the 4H Fairgrounds, 51 South Chelmsford Rd, Westford, MA.

All items may be pre-ordered for best selection through March 29: we will be offering evergreens, tree and shrub seedlings, perennials, edibles, groundcovers and garden supplies (rain barrels, cow manure, compost bins, etc). To place an order, please visit www.middlesexconservation.org. All proceeds benefit our environmental programs, protecting soils and waters in Middlesex County. For more info please call 978 692 9395…

2.  UMass Home Garden Workshop Series.  Follow the link below for details:

Eight hands-on workshops are being offered, ranging from grafting fruit trees to native pollinator conservation.

The workshops being offered include:
* Pruning Fruit Trees, A Hands-on Workshop
* Growing & Pruning Blueberries
* Grafting Apple Trees, A Hands-on Workshop
* Growing & Pruning Grapes
* The 100-Square-Foot, 25-Tree, 5-Variety Backyard Apple Orchard Fruiting Wall!
* Insect Pests & Diseases of Apples – and how to manage them
* Edible Forest Gardens – an introduction to permaculture principles for your yard
* Native Pollinator Conservation

Locations and dates vary with each workshop.  Go to <https://extension.umass.edu/fruitadvisor/mass-aggie-seminars-2013>  for complete information and how to sign up