Thanks for the help, everybody! I'll have to figure out whether the Chestnut Hill Oishii considers itself a separate establishment--- my gift certificate points, ominously, to the South End. Such a good suggestion about lunch! It's such an annoyance when restaurants don't list prices on their websites.
We go to the Chestnut Hill location (never been to the Boston one), and $50 will get you a very decent lunch. For dinner, it can get you almost decent dinner for the 'menu price', but with tax and tip, a more realistic total would be $70-80. Not had omakase, but I don't think that for two, that with $50, that is a realistic option.
Of course, it's easy to spend much more.
I agree. You can order the chef sushi and sashimi special, two hand rolls, a maki or two for $70-$80 total. Everything so good it's hard to keep it under $50 budget because you wanna keep eating. You can also take out to save $10 in tips and eat at the picnic bench in the huge park on the side street.
If you must go to the South End Oishii, go for lunch. They have a $25 lunch box and a $30 lunch box, both which are very good. But I will agree with everyone else and say the Chestnut Hill location definitely gives you more bang for your buck (I like it better overall too). Just remember it's only like 12 seats or so (I forger the exact amount) so you'll have to wait in line or go at an off time.
New Kaiseki Lunch #1
Green Salad Sesame Dressing
Fresh Lobster Wild Mushroom Risotto
Seared Wild King Salmon Sweet Soy
Crispy Rock Shrimp Lemon Aioli
Oishii Crab Cake
*Spicy Tuna Salad Handroll
Grilled Miso Black Cod
New Kaiseki Lunch #2
Grilled Miso Black Cod
Broiled Egg Plant
Hot So-Men Noodle
*Spicy Tuna Tempura Maki
*Salmon Avocado Maki
Shrimp Tempura, Asparagus Tempura
Broccolini Sesame Dressing
If you've got a $50 GC, skip the South End Oishii and head to Chestnut Hill Oishii. Also you might consider adding $20-30 of your own to the tab, if only to give you more variety of the many hand rolls, baked rolls and other offerings. My DC and I have been able to get out of the CH Oishii for years for $75-80 and be satisfyingly full (almost stuffed I'd say).
I say skip the South End because the couple of times I have been there, once to try it, another time to confirm my suspicion, I found it to be hideously expensive for what you get. The kind of feeling you get when you order a $75 omakase, look at the plate and think "Seriously? That's it?"